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    Re: Time Zones
    From: Tony S
    Date: 1999 Aug 17, 3:55 PM

    Dan Hogan wrote:
    
    (see below)
    
    Exactly, Dan! The 1/2 hour differences in the So. Pacific are meaningless
    for navigation purposes. These are "political" convenience times for local
    residents accustomed to sun travel. Even in Florida there are differences
    between zone times and political times. (FL is on the demarcation points,
    considering its panhandle.)
    
    Tony
    
    
    >
    > Millard:
    >
    > I haven't seen a reply...so.
    >
    > You navigate by  Universal Time (GMT, etc) and Zone Time. The "Standard
    > Time Zones" are political. The are based on the 180 degrees divided by
    > 15, for the prime meridians, But there is a lot of political
    > gerrymandering of the lines and times. You would use it to check your
    > local arrival time. Otherwise use Zone Time. Or better yet navigate
    > using UT/GMT.
    >
    > Just remember that the zones are every 15 degrees and extend 7.5
    > degrees either side of the zone meridian.
    >
    > >I just happened to look in a old World Atlas at a map giving the World
    > >Time Zones.  It was color coded with four colors for the time zones.
    > >
    > >Standard Time Zone for even-numbered hours from Greenwich time.
    > >Standard Time Zone for odd-numbered hours from Greenwich time.
    > >Time varies from he standard time zone by half hour.
    > >Time varies from he standard time zone by other than half hour.
    > >
    > >My question is:   Does these half hour time zones effect any type of
    > >navigation... Land or Sea.
    >
    > Dan Hogan WA6PBY
    > C27 "Gacha"
    > dhhogan{at}nav.cnchost.com
    > Navigation-L: http://nav.cnchost.com
    

       
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